After abandoning Tokyo for his island home, Kanae seeks out his childhood companion, Akari. Their reunion, however, is disrupted when Kanae inexplicably jumps forward four days in time. Discovering a tragic event involving Akari’s brother, Akito, Kanae delves into a mystical phenomenon called 'Rollback,' aiming to alter fate and rewrite the past to prevent Akito’s demise and win Akari’s affection.